| 摘要 |
Apparatus and methods for demodulation are provided. In one embodiment, a method includes receiving an input signal having a frequency that varies in relation to a state of the signal, calculating a sine and cosine of a phase control signal, generating a first signal proportional to the sine of a product of a first quantity and the frequency of the input signal, generating a second signal proportional to the cosine of a product of the first quantity and the frequency of the input signal, and summing a product of the first signal and the cosine of the phase control signal with a product of the second signal and the sine of the phase control signal to generate a demodulator output for resolving the state of the input signal. In certain implementations, the phase control signal is controlled so as to reduce a frequency error of the input signal. |
